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	Eng ID	Term	Definition
	3221	meridian: initial	A MERIDIAN through the ORIGIN of a system of GRID COORDINATES and used as y-AXIS of the system. Also called central meridian.
	3222	meridian: local	The MERIDIAN through any particular place or observer, serving as the reference for LOCAL TIME, in contrast with GREENWICH MERIDIAN.
	3223	meridian: magnetic	A line of horizontal magnetic force of the EARTH. The vertical plane in which a freely suspended, symmetrically magnetized NEEDLE, influen... more A line of horizontal magnetic force of the EARTH. The vertical plane in which a freely suspended, symmetrically magnetized NEEDLE, influenced by no transient, artificial, magnetic disturbance, will come to rest.
	3224	meridian: photograph	In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is parallel to the PRINCIPAL PLANE. Since all... more In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH of any horizontal line in the object space which is parallel to the PRINCIPAL PLANE. Since all such lines meet at infinity, the IMAGE of the meeting point is at the intersection of the PRINCIPAL LINE and the HORIZON TRACE, and all photograph meridians pass through that point.
	3225	meridian: prime	The MERIDIAN of LONGITUDE 0°, used as the origin for measurement of LONGITUDE. The MERIDIAN of Greenwich, England, is almost universally use... more The MERIDIAN of LONGITUDE 0°, used as the origin for measurement of LONGITUDE. The MERIDIAN of Greenwich, England, is almost universally used for this purpose.
	3226	meridian: principal	(U.S. terminology). A true north-south line (a MERIDIAN) extending both north and south of the INITIAL POINT in the rectangular system of SU... more (U.S. terminology). A true north-south line (a MERIDIAN) extending both north and south of the INITIAL POINT in the rectangular system of SURVEYS. Together with the BASE LINE they constitute the axes of a system and the INITIAL POINT the ORIGIN of that system. See PRINCIPAL LINE.
	3227	meridian: standard	The MERIDIAN used for reckoning STANDARD TIME. A MERIDIAN of a map projection, along which the SCALE is as stated.
	3228	meridian: terrestrial	See MERIDIAN: ASTRONOMICAL.
	3229	meridian: true	A MERIDIAN. The expression is used to distinguish the GREAT CIRCLE through the GEOGRAPHICAL POLES from MAGNETIC MERIDIAN, COMPASS MERIDIAN, ... more A MERIDIAN. The expression is used to distinguish the GREAT CIRCLE through the GEOGRAPHICAL POLES from MAGNETIC MERIDIAN, COMPASS MERIDIAN, or GRID MERIDIAN.
	3230	meridian: zone	The MERIDIAN used for reckoning ZONE TIME.
	3231	meridian altitude	See ALTITUDE.
	3232	meridian angle	ANGULAR DISTANCE east or west of the local CELESTIAL MERIDIAN; the arc of the CELESTIAL EQUATOR, or the angle at the CELESTIAL POLE, between... more ANGULAR DISTANCE east or west of the local CELESTIAL MERIDIAN; the arc of the CELESTIAL EQUATOR, or the angle at the CELESTIAL POLE, between the UPPER BRANCH of the local CELESTIAL MERIDIAN and the HOUR CIRCLE of a CELESTIAL BODY, measured eastward or westward from the local CELESTIAL MERIDIAN through 180°, and labelled E or W to indicate the direction of measurement. See HOUR ANGLE.
	3233	meridian-arc method	A method of determining the dimensions of the ELLIPSOID by measuring (by TRIANGULATION) the linear distances between three points on a MER... more A method of determining the dimensions of the ELLIPSOID by measuring (by TRIANGULATION) the linear distances between three points on a MERIDIAN and the ANGULAR DISTANCES between them from observed differences in their ASTRONOMICAL LATITUDES.
	3234	meridian distance	In ASTRONOMY, the HOUR ANGLE of a CELESTIAL BODY when close to but not exactly on the ASTRONOMICAL MERIDIAN. In PLANE SURVEYING, the perpend... more In ASTRONOMY, the HOUR ANGLE of a CELESTIAL BODY when close to but not exactly on the ASTRONOMICAL MERIDIAN. In PLANE SURVEYING, the perpendicular distance in a horizontal plane of a point from a MERIDIAN of reference.
	3235	meridian distance: double	The algebraic sum of the perpendicular distances from the two ends of any line of a TRAVERSE to the initial, or reference, meridian.
	3236	meridian passage	See MERIDIAN TRANSIT.
	3237	meridian sailing	See SAILING.
	3238	meridian telescope	See TELESCOPE.
	3239	meridian transit	The apparent passage of a CELESTIAL BODY across a CELESTIAL MERIDIAN. Upper or superior transit is the passage across the UPPER BRANCH of th... more The apparent passage of a CELESTIAL BODY across a CELESTIAL MERIDIAN. Upper or superior transit is the passage across the UPPER BRANCH of the CELESTIAL MERIDIAN. Lower or inferior transit is the passage across the LOWER BRANCH. The lower transit may take place either above the HORIZON as is the case of CIRCUMPOLAR CELESTIAL BODIES, or across that branch of the MERIDIAN lying below the observer's HORIZON. Also called TRANSIT, meridian passage, CULMINATION.
	3240	meridional difference	The difference between the MERIDIONAL PARTS of any two given PARALLELS.
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